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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bf353eac417723f1dbf01f48b491ef4e12c997c673f09de58e542a043db26d' 
  AND token = 'z+WFCGp25IJ+88RxUUX5Xfvi9yCS51a1MQd6tu633CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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