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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5846cf38420cbfb0cde45e837504e85513de7a684e1d68b595e1ce96b0c1d118' 
  AND token = '3fqBO5dLQ/67Ov32ZZOXYq1EfdaTvflBxG8B9RsT5Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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