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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843e3a224bd01764b2fe66cdcb107ba5dd1fbeb25ea5109ac757b0bee8d10bb' 
  AND token = 'OZCJefGHbicsXUIfMnJkcW08mevBbZokEL69rKLcSsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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