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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10635aa797d1446727e083d1de2ea29ee808338936d3f35cee5ae204023ced47' 
  AND token = 'SIHpQZptwNHw9S0Pyz5GDUTXZDmhrOShY55qVDkmRBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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