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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fa37ab44f901f2516196f57e2107fd028cae20069f7fbe5bd52fc62ee50481' 
  AND token = 'f74pmvh3SULgSCln9RYe6T1zFuo3DykWMXTMsOKVI/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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