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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd323413904b523f7d2192eaa4566f7f090253aebbf21dc234d0678c5a3f9c666' 
  AND token = 'as73hazWBg0pztKExsAqfs5nDsvlUYbfkrnRC2UG/sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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