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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febade26fe2ef7b2767d5e4e82054055782f35d44f4c16c1a022a496ca62ca71' 
  AND token = 'NX7qOyGCvT1HWV7YXNss736PbbbLpO1FpWdjEMWxZUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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