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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed19aacb9017530b2da43c017a124b797612d41820b880e30a0863e7b3e6d03' 
  AND token = 'lFcBpqBikgFPWJk03prw1JMt5bk6kMPTavHJ+U7vrYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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