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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f04bfadc5360e96888995d33da8cf6583e5077776dd7622b8c724a2b5f1a35' 
  AND token = '1wwqNffQy19x8aGcm7rDrIWKATxxg5JipgSC3+Zwlos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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