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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfe7f9451ea0147a05228dd71298b9c2571fb6a7e5744f6b19a61bf3660e731' 
  AND token = 'F/rr1gL5Zerm/GOi7mWp7xG+YDK4258D6CXL2/5PEFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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