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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484666605bc4a38b5ad53eb656492c7fad4d6b6400c50203bc1f9faadf2595f7' 
  AND token = 'xkGptXIxPWdJw535budPZ0abX1uIxWkbGTSSR5w+aN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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