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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3366d3f53cf0152564d8d39b9de568b1df323822b87340d130deea354d9a0dd8' 
  AND token = '38xypnDwg+EriTMM8S8eaFKll7jAfIDXnVxDCTdFOjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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