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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a518b473bb8f2933a4b45f9d2dab962e8336e97d3e8cdcd25ca7f8839279caf7' 
  AND token = 'mbiJ8Vr32CwiBZg/4jOCr6a2ePb5jVnxdFM8kEKqYKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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