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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c947170572c3c548316b5f6571ef8d9c806b47a95a7ffcf5dc324ae9a23850a' 
  AND token = '/8fGes7aQMReF69+hQS4S0jAAMxuPE88NXNwMVWnFmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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