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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08f7e4609a8e244b9e2a9048fc196d219635f881e3578b119a30afd3e20d730' 
  AND token = '1ogrbjuvAr0/4LBjisUsLTP8NR155yU/qzBbpCJ1DE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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