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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5287e4838b349eed99fd4db346bed99b96af6e5ebe2a47d7107d39d03d17499e' 
  AND token = '2w3VLg03K7xCc05phvTtrYNG8svMAXJdTwThnjW9rTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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