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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f1599a579f0a6df27b8583a2be2a8daf65de41be7ad0e24a3185fc6dc3f770' 
  AND token = 'fVm9gDUNqfAIBOvb04IJf0rhEFsAjuFHQjHRhMowSFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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