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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b07adcb52e5dc3bc843b8c31b573a88ce7d7423b24482701011b1be992a7720' 
  AND token = 'yho0tcL128Lh5mYIhq9Rx8TCCj3C+cn2wXC+D6RLZs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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