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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51ceba3db851c9d6d1b3a8746741d6c2daac3042c7b8bac29def692ca1cadcf' 
  AND token = 't97eQIr00QFL8KjuRAOTfYp9DDl+kfoKDZKR0KWHuhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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