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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c6f705227756fa3f9c71161b99118260ca394f54e1e16263a45ed9edaa908c' 
  AND token = '0JMP7Fv5NztJg7hKZkRPMos7CHZQZfDXspK7pYSI8gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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