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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575d0bed589ed3b9edc6faa8052d22ffb2cf34283151031d0f807248b8a9d14e' 
  AND token = 'al6cANBKaU9c2SnCE4iCOsZIhW1fHZY1ERej8HuyYBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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