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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b099ac807c7c714b8cf3d86807d7d1873c492fc4a38e36e145886431d805775' 
  AND token = '2OW+nLwSZV0Ed9aNRzMYuxYJJVbDgwpuMkb7stLkn4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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