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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19149f9de09c459d7b5602e8f37757f35595922d5be7cd4668a42e7b8ae772c' 
  AND token = 'Na8m87yvNckJmZnElv7qARyHZEsVfJTSA2H99CKrsWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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