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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0bbd92e569ad135206283f1d53839c7fe471c372fab27953b16352b5eae232' 
  AND token = 'fe8ejdAEy54crEO+FfdYxMVgTCc5Rj8oydbzqSER8zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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