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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af54291997ab13a1d9170f64f3becac336f4c8542a76d5e7b5bd0183c351b738' 
  AND token = '1Ua/uob7aMRIPCYIH/1g9rqh3zYMv0ormYi/K4Lqba0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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