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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfb134a79c46b159e405ff8ddd4084a8a8a3ca315d884ccbd86c17cde73eb2f' 
  AND token = 'gLRZhZFaGbyIaKD8X4lP9xQEjmDJAAyjPeQT85UMg4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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