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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717f2413bf17fe888de3a09ce54fea4c0180325d22bdf22f5cd74d3c86bb1778' 
  AND token = 'TW/VQrp78/iSxquTGcoIsEf2wZw0/kQIWoXcbGq9olU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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