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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895da48d3d61a1dcb1909e94180f9c666de753ab1811114117a0f806d06ef74a' 
  AND token = 'uuyVGqN+YSxhSRFKFBaAvzzl5O6DViKosrHd9T9ApdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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