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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7909c1eb376db56876e5beb8202b987b84347ae56de0809e559ff29687ed6a' 
  AND token = 'jAlMrmRQpAhEvAIUdTEdfa/zD9CjodegVNdZ7tQCAas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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