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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1558194906766bfd8b05e4f983cccd0be05fcd2a42f9c764d4fabaa58ee6f77b' 
  AND token = 'DggYCic7F657Q9m9lWqwHO1DPAvIXL6ydG9uKsCgVEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}