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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0eeaf2af4d13cc9d6a3659b1dbb1d2decd7314ee8d896fc51aa4a74db79ca6b' 
  AND token = 'Vq0Ta4J5vgJWhPp31SbIxj31y0zdAzUgmPa2517YxBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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