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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0c7af4683e14fe18a04f88d3c9597bf519381a337a919827af199a357b95eb' 
  AND token = 'KsShdeyNlUTniv0TQ9oHVScHzSID18xgnFO/gxo+2r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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