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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae67a68e0de3c08ee1e1f53b2728a601f628d18ff4c98fc1b855d28a76b86163' 
  AND token = 'F9lu1U9bo+6wBltHekWtOieg4fACyPTju5ZYJMI8jOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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