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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab439b5605ecc8f8030f17bcf1bd5adb31ff6e0c6ffd2bd8adec50b7bce05a8' 
  AND token = 'YDgXcL6/f6cgL2UrriKMxkvq0xW1NiljwDLdBS6/dxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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