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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23f0bdfa678fbc9325c79e249fa31c5ca013d76548fcedc11f2355d4a26b02b' 
  AND token = 'pkb/Z6/loRf8lk8EhTBQ9aL0ahAMlP6dw9hejMqoEJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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