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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d3c2e8840feaa637c6a721ea14dbd77b6e91e9b3e2aa1faa1de0292728d73b' 
  AND token = 'RQ69VXJrAL1Qd7LUXdPO4TTpwrOEXGHRxZGHSiGZNTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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