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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95663f4e31aad6f0d11971a8c5de723973673c11247a46a175a3d9b58513d049' 
  AND token = 'fyrHEj1E/hVElgD4uutb7DCNF0cIhi3PlkmOWGAiNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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