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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368b35543cd7e199e771fa9ab969a6441d530db86d7b6c460d5a94e7426f345e' 
  AND token = 'dStG0zDLhS0wiJCPP5OfQNkTWZdKTnFPN0WGebo1Q4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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