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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1abf93bf04ed363127f1a7d8a5f9cb6cf26c890601a3a4964ee9aa748cace93' 
  AND token = 'NKH9FUqRu7Bjspd3aXp03HsEBaQeoxMh1gLavFc7sZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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