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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c098c8607085a45edfbac127e42f425c1eae101c534cfb79d4d052262f99e70d' 
  AND token = '58/Q3JSxjfIqCU50meNBTKMsNrFyI9Wp8I4J5gTE46Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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