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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f0e28b2daa6f2403dbd8a45f8f5e2a1687c5f6a00e54f0dc6bcb2b58ff4eea' 
  AND token = 'sPplAcZZvpTY1iYYslihiJtZ5xGLW7w1GeNzot1KvkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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