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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fc7d7600cc2358790198fe3b630ea0c5ba7ae3e15cb7f316092c967962cf67' 
  AND token = 'WQw9MrOajx49UoeIbkpuY76cIl80OS7QRPwZMU5h70s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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