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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4678a57bba8a843c4a66dd48380b238210c0ae258f627b3462ab5881665f503a' 
  AND token = 'exyWmde0iyI7F10gKASxtHntPTOch9NKPMei0+RD4/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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