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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b35580df8d330004a25b10e8f6b7608e0e662f4cd028f578c73efd806c479a' 
  AND token = 'FTqQszX/YvRt6x1+SYRoio6Ddfggn4JG0iUgbYDk6Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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