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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9b521f3d7979c25ac924f03aa11b8d1b2e79558dd8b942420408a294242a74' 
  AND token = '17p2qlwYtrP/mg2RX60sFjNUc6+8BrrfGN2qKkPlp+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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