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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8c897daf14242b88431acdfe3228d52bf4ba60e1a93ac5709c146bd2d70ae3' 
  AND token = 'w5zuBENOxzk3hppJAbxWIElx2OMgCIJmLDFj0wIV2GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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