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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dc053668e8d7124b94d43ff90e8dfd0a0a61cbd47765f43fb4c933d4f1b78d' 
  AND token = 'vX2FcfILuAyEGVAn+KVvhkwU1dp7M9rK/FGfselMKxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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