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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601bbe08bd4660a20e5d51b0cfd5b4620c23ca4edaa93c25cd9ebf0a49fc29c7' 
  AND token = '01RK4Y2rdbeyC3n8AAGeV8g3F/uWRNtFg+irgq3UTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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