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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a3098f383cc719cb2ccd705081704c59ff72332668d5cf84c57fb86bcf3e71' 
  AND token = 'fNL7WO3qZ5C/1Odk7EGT+h1TnrhRGJrj2x2AyYuz9kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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