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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6604dcee39cc69b44b261e47dca30bc95996e9d0c19604823c301811d6d15b7' 
  AND token = 'p/ugk506TF+s8eaNvs2RvgA+zrfSqFZi2huS0E2vIXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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