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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fe159e4c11453192355eee5f23a92abec4149229765de1a990da1b9dfc9f9d' 
  AND token = 'TKVREThlMHElvZIzTar+Zb1kf1K95uRwnoqCc47/7sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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