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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cd9d7037852469179064f3abf2794c28e4b6871030ebe8145004fec06ffb3d' 
  AND token = 'tibwbqzAD1Z5CfnyVOZCEVwJ2Bo8Kc6IEoc13AIUPi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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