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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd47ee381ce155896fa9b6ba958e0299f7fa338dc4248a6ba78a854af10f6f9b' 
  AND token = 'O8GdmqLEgD/tCZXtxy91cg+n3ZnlF6m7cK7uJmisb20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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