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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac92de9186b000f7264da9d6213f12914845e3456671336168f64476fa92706e' 
  AND token = '7GIotPP7dEAm9TObjBd65xycqZZfZyYyoOJH6C5pnK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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