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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cca427a51012e094225b59b7dedd2ffc3425c787191b1e4cfecd8594f6cf93e' 
  AND token = 'TypEsKOM4lYZd4zzuR5ioJYYN5ZhKQHSD1296VWolAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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