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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff43d679faa00c55247db141a2673638db9a3df45a40140fdd8de69e5884d96a' 
  AND token = 'pbDgaKtD1vG/g1eP7K0rD9LesUX8AYuvAwDnI/fwbrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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