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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737231177aadc23a7d023e10720d629c8e493a982860c620e3e68963fd466929' 
  AND token = 'WmgvjJpM5JOB0imjwS7nl/cvN3n+yGg539ezZrR3Cp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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