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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5095df1a0ef983e478f45f882d29923c318f3de8957612f58f363c50d548c557' 
  AND token = 'uurB5405hZv7K/Rx6HF1HHnX/zq2OXwZhS0wFiIuxtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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